261458989 has 8 divisors (see below), whose sum is σ = 285347232. Its totient is φ = 237590640.

The previous prime is 261458987. The next prime is 261458999. The reversal of 261458989 is 989854162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261458989 - 2¹ = 261458987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261458987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41182 + ... + 47104.

It is an arithmetic number, because the mean of its divisors is an integer number (35668404).

Almost surely, 2^261458989 is an apocalyptic number.

It is an amenable number.

261458989 is a deficient number, since it is larger than the sum of its proper divisors (23888243).

261458989 is a wasteful number, since it uses less digits than its factorization.

261458989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9947.

The product of its digits is 1244160, while the sum is 52.

The square root of 261458989 is about 16169.6935345108. The cubic root of 261458989 is about 639.4420503440.

The spelling of 261458989 in words is "two hundred sixty-one million, four hundred fifty-eight thousand, nine hundred eighty-nine".